CoFe2O4@PDA@Pt核壳型磁性复合材料的制备及催化性能

采用溶剂热法制备磁性CoFe₂O₄亚微球，以CoFe₂O₄为核在碱性条件下将多巴胺(DA)聚合在其表面，利用乙二醇和聚多巴胺(PDA)的多羟基还原性，将Pt原位还原负载在CoFe₂O₄@PDA表面，合成纳米核壳型CoFe₂O₄@PDA@Pt复合材料。利用TEM、XRD、振动样品磁强计(VSM)和XPS对CoFe₂O₄@PDA@Pt复合材料的微观形貌、结构和晶型等进行表征。以无机染料铁氰酸钾和有机染料对硝基苯酚为目标污染物，探究CoFe₂O₄@PDA@Pt复合材料的催化活性。结果表明，2 min内CoFe₂O₄@PDA@Pt复合材料对铁氰酸钾降解率为95%以上，对对硝基苯酚降解率约为99.3%。 

Preparation and catalytic properties of CoFe2O4@PDA@Pt magnetic composite with core shell structure

Magnetic CoFe₂O₄ submicrospheres were prepared by solvothermal method, and dopamine (DA) was polymerized on the surface under alkaline conditions with CoFe₂O₄ as the core. The polyhydroxyl reducibility of ethylene glycol and polydopamine (PDA) was used to reduce the Pt in situ on the surface of CoFe₂O₄@PDA to synthesize nano CoFe₂O₄@PDA@Pt composite. The micro morphology, structure and crystal morphology of the CoFe₂O₄@PDA@Pt composites were characterized by TEM, XRD, vibration sample magnetometer (VSM) and XPS. The catalytic activity of inorganic dye potassium ferrocyanate and organic dye p-nitrophenol were investigated as the target pollutants. The results show that the degradation rate of potassium ferrocyanate is over 95% and the degradation rate of p-nitrophenol is about 99.3% within 2 minutes.